Presentation is loading. Please wait.

Presentation is loading. Please wait.

The Lightweight Straw Tube Tracker for PANDA Detector at GSI Andrey Sokolov *,1, James Ritman 1, Peter Wintz 1, Paola Gianotti 2, Dario Orecchini 2 1 Institut.

Similar presentations


Presentation on theme: "The Lightweight Straw Tube Tracker for PANDA Detector at GSI Andrey Sokolov *,1, James Ritman 1, Peter Wintz 1, Paola Gianotti 2, Dario Orecchini 2 1 Institut."— Presentation transcript:

1 The Lightweight Straw Tube Tracker for PANDA Detector at GSI Andrey Sokolov *,1, James Ritman 1, Peter Wintz 1, Paola Gianotti 2, Dario Orecchini 2 1 Institut für Kernphysik, Forschungszentrum Jülich 2 Laboratori Nazionali di Frascati, Italy

2 PANDA detector Target spectrometer: MVD + STT/TPC + MDC Time Of Flight DIRC + RICH Electro-Magnetic Calorimeter Muon detection Superconducting solenoid Forward spectrometer: Dipole magnet MDC or STT RICH EMC Hadron calorimeter Muon detection STT or TPC Bernd Ketzer HK57.1

3 Requirements to the Central Tracker  Almost full angular coverage;  High momentum resolution, δp/p~1% ;  High spatial resolution, σ rφ ~150μm, σ z ~1-3mm ;  Minimal detector material budget, X 0 ~1% ;  High rate capability, 10 7 ev/s ;  Resistance against aging effects, 1-2 C/cm/year ;

4 Central Tracker Options Time-Projection Chamber (Christian Höppner, HK 38.2) Straw Tube Tracker

5 Straw Tube r Typical spatial resolution μm ~2 kV Ar+CO 2

6 Straw Tube

7 Pressure Stabilized Straw Tube Elongation 1.5mm +50 μ m P abs =2 atm Overpressure gives the stability and rigidity to the straw tube, but it also change straw tube dimensions. That should be taken into account in the tracker design.

8 COSY –TOF Straw Tube Tracker One double layer Pressure Stabilized Straw Tube Tracker

9 Spatial Resolution Spatial resolution of the COSY-TOF straw tube tracker Ar+20%CO 2

10 Proposed PANDA pressure stabilized straw tube tracker Pressure Stabilized Straw Tube Tracker 1.5m

11 Aging Phenomena in Straw Tube  Gas gain in the straw tube can deteriorate and dark current (noise) can increase with a time due to aging effects, namely: –deposit of the conductive polymers on the wire surface; –formation of an insulation coating on the cathode (Malter effect); –anode wire swelling by the free radicals; –oxidation of the conductive layer on the cathode surface.  These aging phenomena are typically observed for the accumulated charge values > 1-3 C/cm, depending on the gas mixture.

12 Aging Phenomena in Straw Tube Anode wire surface after irradiation [ATLAS TRT, NIM A512(166)]

13 Longitudinal Hits Projection 1000 events of pp collisions (DPM generator) protons

14 Hit/Charge Density Along Straw Length

15 Conclusions and Outlook  New design for the PANDA Straw Tube Tracker has been proposed;  The total weight of the tracker will be only about 50 kg;  The spatial resolution is about 150μm using Ar+10%CO 2 gas mixture;  The background simulation shows the very high radiation load;  The beam test is under preparation;  The test and simulation results of the PANDA straw tube tracker demonstrate the feasibility of the chosen detector concepts.

16  Total number of tubes - ~5000 ;  Radial dimensions – 16-42cm ;  Length – 1.5m ;  Tube diameters – 10mm ;  Tube wall material – Mylar, 30μm ;  Anode wire – W/Re, 20μm ;  Spatial resolution – σ rφ ≈150μm, σ z ≈3-10mm ;  Gas filling – Ar+10%CO 2 ;  Gas absolute pressure – 2 bar ;  Thickness - ~1% X 0. STT parameters

17 Longitudinal Coordinate Measurement  Skewed layers –1-4 mm precision;  Charge sharing: –10-20 mm precision;  Time of charge propagation: –10-20 mm precision. One planar double-layer with the skewed straw tubes

18 HESR: High Energy Storage Ring Beam Momentum GeV/c High Intensity Mode: Luminosity 2x10 32 cm -2 s -1 (2x10 7 Hz)  p/p(st. cooling)~10 -4 High Resolution Mode: Luminosity 2x10 31 cm -2 s -1  p/p(e- cooling)~10 -5

19 Straw Tube Straw Tube Tracker


Download ppt "The Lightweight Straw Tube Tracker for PANDA Detector at GSI Andrey Sokolov *,1, James Ritman 1, Peter Wintz 1, Paola Gianotti 2, Dario Orecchini 2 1 Institut."

Similar presentations


Ads by Google